JP5177100B2 - Equipment transparency detector - Google Patents

Description

  The present invention relates to a permeability detecting device that detects the permeability of washing liquid in a washing machine or washing liquid in a dishwasher.

  Conventionally, in order to detect the permeability of the washing liquid of the washing machine, a permeability detector is provided in the vicinity of the drain pipe (for example, see Patent Document 1).

  FIG. 5 is a cross-sectional view of the transmittance detecting device provided in the fully automatic washing machine, and the configuration thereof will be described below. The light emitting element 1a and the light receiving element 1b are arranged facing each other across the water distribution pipe 10 through which the washing liquid passes. The light emitting element 1a and the light receiving element 1b are electrically and mechanically connected to the printed wiring boards 2a and 2b, respectively. The light emitting portion and the light receiving portion of the element are secured relative distances on the same optical axis and are fitted into the recesses provided in the cases 3a and 3b to be regulated in position. The printed wiring boards 2a and 2b are mounted on the cases 3a and 3b and sealed with sealing materials 4a and 4b such as epoxy for moisture prevention.

  The detected signals and the like are electrically connected to a control device (not shown) through lead wires 6a and 6b. The components 7a and 7b on the printed wiring boards 2a and 2b are protective elements such as diodes for protecting the light emitting element 1a and the light receiving element 1b from inductive noise entering from the lead wires 6a and 6b. The cases 3a and 3b are fixed to the cover 9 with screws 8a and 8b.

  In the transmittance detecting apparatus configured as described above, the interior of the water distribution pipe 10 is filled with the washing liquid at the time of washing or rinsing, and the light emitting element 1a emits light with a predetermined illuminance. At that time, the degree of voltage generated in the light receiving element 1b is detected to detect the permeability of the washing liquid. The illuminance setting of the light emitting element 1a and the processing of the voltage generated in the light receiving element are performed on the control device (not shown) side. That is, control is performed such as automatically adjusting the washing time and the rinsing time by detecting the permeability of the washing liquid.

Japanese Patent Laid-Open No. 3-168188

  However, in such a conventional transmission detecting device, it is necessary to leave the sealing materials 4a and 4b for a predetermined time in order to inject and cure the sealing materials 4a and 4b into the cases 3a and 3b. At this time, if an air layer remains in the space between the light emitting element 1a and the light receiving element 1b and the printed wiring boards 2a and 2b, air bubbles appear in the case opening as the sealing materials 4a and 4b are cured. The effect cannot be obtained.

  In order to prevent such a state, immediately after injection of the sealing materials 4a and 4b, it is put into a vacuum defoaming machine, and the air layer between the light emitting element 1a and the light receiving element 1b and the printed wiring boards 2a and 2b is forcibly removed. It took a lot of man-hours and costs such as performing the original curing.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an inexpensive moisture-proof type device for detecting the transmittance of a moisture-proof device by suppressing the generation of bubbles during manufacture.

In order to achieve the above-mentioned object, the present invention solders a light emitting element and a light receiving element, which are arranged to face each other, to detect contamination of liquid in a pipe, and the light emitting element and the light receiving element to respective printed wiring boards. and a case to be inserted in, the case has a first recess for inserting a light emitting element and the light receiving element, respectively, the air layer between the printed circuit board and the light emitting element, and and an air layer between the printed circuit board and the light receiving element is the provided with a through hole so as to communicate with the air outside the case to each of the printed wiring board, the second seal each of the air layer After filling with a stopper material, the outside of each printed wiring board is filled with a first sealing material .

  Thereby, since the air layer between a printed wiring board and the terminal part of an element is filled with a sealing material, it can prevent that a bubble generate | occur | produces from the inside during hardening of a 1st sealing material. Therefore, it is possible to eliminate the work of putting in a vacuum tank before curing.

  The transmittance detection device of the present invention can realize a low-cost and highly reliable moisture-proof device transmittance detection device by suppressing the generation of bubbles during manufacturing.

1 is a side sectional view of a device for detecting a transmittance of a device according to a first embodiment of the present invention. FIG. 2 is an enlarged sectional view of a light receiving unit of the device for detecting a transmittance of the device according to the first embodiment of the present invention. The figure which shows the light-receiving part plane and side cross section of the transmittance | permeability detection apparatus of the apparatus of Embodiment 2 of this invention The figure which shows the light-receiving part plane and side cross section of the transmittance | permeability detection apparatus of the apparatus of Embodiment 3 of this invention Cross-sectional side view of a conventional device transmittance detector

A first invention is a case in which a light emitting element and a light receiving element disposed to face each other in order to detect contamination of liquid in a pipe, and a case where the light emitting element and the light receiving element are soldered and inserted into respective printed wiring boards. with the door, the case has a first recess for inserting the said light emitting element and the light receiving element, respectively, and the air layer between the printed circuit board and the light emitting element, and the printed circuit board as an air layer between the light receiving element is the provided with a through hole so that air communication with outside of the case in each of the printed wiring board, fill each of the air layer in the second sealing member Then, the outside of each printed wiring board is filled with the first sealing material, thereby filling the air layer between the printed wiring board and the terminal portion of the element with the sealing material. So while curing the first encapsulant It is possible to prevent the air bubbles from the interior are generated. Therefore, it is possible to eliminate the work of putting in a vacuum tank before curing.

Moreover , it is possible to prevent an air layer from being formed only during the injection operation with the first sealing material. In addition, it is possible to eliminate the work of putting in a vacuum tank before curing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a side sectional view of a device for detecting a transmittance of an apparatus according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged sectional view of a light receiving portion of the device for detecting a transmittance of the apparatus. In FIG. 1, cases 3 a and 3 b incorporating a light emitting element 1 a and a light receiving element 1 b are fixed to a cover 9 that covers the water pipe 10 with screws 11 a and 11 b. Furthermore, the cover 9 is fixed with a screw 12 to a convex portion 13 provided outside the water distribution pipe 10 through which the washing liquid passes. The space between the light emitting element 1a, the light receiving element 1b, and the printed wiring boards 2a and 2b is filled with second sealing materials 5a and 5b such as silicon sealing materials. Furthermore, the outer side of the printed wiring board 2b (the opposite side of the water distribution pipe 10) is filled with the first sealing materials 4a and 4b to take a moisture-proof measure.

  With respect to the device for detecting the transmittance of the device configured as described above, the light emitting side and the light receiving side are opposed to each other, and the periphery of the element will be described with reference to the enlarged sectional view of the light receiving unit in FIG.

  The light receiving element 1 b receives light from the lens unit 15 and extracts an electric signal at the terminal 17. The position around this element is fitted into a first recess 16 provided in the case 3b and the position is regulated. An air layer 14 is necessary between the lens portion 15 and the first concave portion 16 in order to efficiently collect light due to the lens effect, and the fitting relationship is such that the moisture-proof second sealing material 5b does not enter. .

  In addition, since the base portion of the terminal 16 (the lens portion 15 side) is weak in mechanical and heat resistance, the base portion of the terminal 16 is not damaged at a high temperature when soldering to the printed wiring board 2b. The terminal has a predetermined length, and a predetermined distance is provided between the printed wiring board 2b and the light receiving element 1b. For this reason, a space is created between the light receiving element 1b and the printed wiring board 2b.

  If this space is left as an air layer and the first sealing material 4b is injected and cured as a moisture-proof treatment, bubbles will be generated outside during curing. In order to prevent this, the second sealing material 5b such as a silicon sealing material is filled between the light receiving element 1b and the printed wiring board 2b and then the first sealing material 4b is filled. The second sealing material preferably has a viscosity that does not enter the air layer 14 on the lens unit 15 side.

  The light emitting element 1a side has the same configuration as the light receiving side.

  Filling the space between the light receiving element 1b and the printed wiring board 2b with the second sealing material 5b eliminates the air layer in this portion, and air bubbles are not generated during the curing of the first sealing material 4b. Moreover, the equipment of a vacuum deaerator is not required. This makes it possible to reliably provide the moisture resistance of the transmittance detecting device at low cost.

(Embodiment 2)
The present invention uses the injection of the first sealing material 4b without using the second sealing material 5b, and the air layer between the light receiving element 1b and the printed wiring board 2b is changed to the first sealing material 4b. It is made to fill with. The description of the same configuration as in the first embodiment is omitted.

  With reference to FIG. 3, the light-receiving unit plan view and the side sectional view of the apparatus for detecting the transmittance of the device according to the present embodiment will be described.

  Through holes 21 and 22 are provided in the vicinity of the terminals 17 of the printed wiring board 2b. This through hole is formed by penetrating the air layer between the light receiving element 1b and the printed wiring board 2b and the space outside the case 3b.

  For example, the first sealing material 4b is slowly injected from the through hole 21 with an injection needle-like injector, the air in the air layer is discharged from the through hole 22, and the first gap is formed between the light receiving element 1b and the printed wiring board 2b. It fills with the sealing material 4b. Thereafter, the first sealing material 4b is injected and cured on the solder surface side of the printed wiring board 2b.

  The light emitting element 1a side has the same configuration as the light receiving side.

  The first sealing material 4b is injected from the solder surface side (bottom side) of the printed wiring board 2b without using the injection needle-like injector through the through hole 21, and the light receiving element 1b and the printed wiring If the air layer between the plates 2b is sufficiently removed, it is not necessary to inject them in two portions.

  By filling the first sealing material 4b between the light receiving element 1b and the printed wiring board 2b using the through holes 21 and 22 of the printed wiring board 2b, the air layer in this portion disappears, and the first sealing material 4b is filled. Air bubbles are not generated during the curing of the stopper 4b. Moreover, the equipment of a vacuum deaerator is unnecessary. This makes it possible to reliably provide the moisture resistance of the transmittance detecting device at low cost.

(Embodiment 3)
The present invention uses the injection of the first sealing material 4b without using the second sealing material 5b, and the air layer between the light receiving element 1b and the printed wiring board 2b is changed to the first sealing material 4b. It is made to fill with. The description of the same configuration as in the first and second embodiments is omitted.

  With reference to FIG. 4, description will be made with reference to a plan view and a side sectional view of a light receiving unit of a device for detecting a transmittance of an apparatus according to the present embodiment.

  Second recesses 32 are provided on both sides of the printed wiring board 2b. Further, the case 3b is provided with a path 31 formed by inclining a part of the case 3b in the vicinity of the second recess 32. The path 31 and the second recess 32 communicate with the air layer between the light receiving element 1b and the printed wiring board 2b and the space outside the case 3b.

  For example, the first sealing material 4b is slowly injected from the second recess 32 with an injection needle-like injector, and the air in the air layer is discharged from the other second recess 33, and the light receiving element 1b and the printed wiring board. The space between 2b is filled with the first sealing material 4b. Thereafter, the first sealing material 4b is injected and cured on the solder surface side of the printed wiring board 2b.

  The light emitting element 1a side has the same configuration as the light receiving side.

  The first sealing material 4b is injected from the solder surface side (bottom side) of the printed wiring board 2b without using the injection needle-like injector from the second recess 32, and the light receiving element 1b. If the air layer between the printed wiring boards 2b is sufficiently removed, it is not necessary to inject them twice.

  In FIG. 4, the second recess 32 is provided on the side of the printed wiring board 2b to secure the path. However, the second recess 32 is not provided on the side of the printed wiring board 2b, and the side surface of the case 3b. The same effect can be obtained even if the path is provided by widening.

  By filling the first sealing material 4b between the light receiving element 1b and the printed wiring board 2b using the path 31 and the second recess 32, the air layer in this portion disappears, and the first sealing material 4b No bubbles are generated during the curing of the resin. Moreover, the equipment of a vacuum deaerator is unnecessary. This makes it possible to reliably provide the moisture resistance of the transmittance detecting device at low cost.

  As described above, the device for detecting the permeability of the device according to the present invention can ensure moisture-proof properties at a low cost by the device for detecting the permeability of the washing liquid of the washing machine and the washing liquid of the dishwasher. Therefore, it is useful as a washing machine or a dishwasher.

DESCRIPTION OF SYMBOLS 1a Light emitting element 1b Light receiving element 2a, 2b Printed wiring board 3a, 3b Case 4a, 4b 1st sealing material 5a, 5b 2nd sealing material 6a, 6b Lead wire 9 Cover 10 Water distribution pipe

Claims (1)

A light-emitting element and a light-receiving element disposed to face each other to detect dirt on the liquid in the pipe, and a case for soldering and inserting the light-emitting element and the light-receiving element to each printed wiring board. has a first recess for inserting the said light emitting element and the light receiving element, respectively, the air layer between the printed circuit board and the light emitting element, and between the printed circuit board and the light receiving element Between the air layer and the through-holes are provided in each printed wiring board so as to communicate with the air outside the case, and after filling each air layer to be filled with a second sealing material, An apparatus for detecting a transmittance of an apparatus in which the outside of each printed wiring board is filled with a first sealing material .

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